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MessageDigest with SHA 256 algorithm fails

Anup Bansal
Ranch Hand

Joined: Sep 12, 2006
Posts: 69
Hi,

I need to generate a digest value for securing my message. I am using the follwing piece of code to generate the digest value using the MessageDigest class.
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Security;


public class message {

static String a = "SHA-1";
static String b = "SHA-256";

public static void main (String arg[]){

try {
MessageDigest digest = MessageDigest.getInstance(a);
System.out.println("SHA-1---->"+digest);
digest.update("MY TEST DATA".getBytes());
byte[] result = digest.digest();
System.out.println("Digest value"+result.toString());

MessageDigest dig = MessageDigest.getInstance(b);
System.out.println("SHA256----->"+dig.toString());
}
catch (NoSuchAlgorithmException e){
e.printStackTrace();
}
}
}

The output of this program is:
SHA-1---->SHA-1 Message Digest from SUN, <initialized>

Digest value[B@13e8d89
java.security.NoSuchAlgorithmException: SHA256 MessageDigest not available
at java.security.Security.getEngineClassName(Unknown Source)
at java.security.Security.getEngineClassName(Unknown Source)
at java.security.Security.getImpl(Unknown Source)
at java.security.MessageDigest.getInstance(Unknown Source)
at message.main(message.java:20)

The digest value is properly generated for the SHA-1 algorithm but it does not work for SHA-256 algorithm.
I thought this to be a version problem. The version of JDK I was initially using was 1.4.1.

I found out that SHA-256 is only suported in JDK version 1.4.2 and later.
I have tested the above code using JDK version 1.4.2 and JDK 1.5.
The output is the same.

Can anyone please tell me where have I gone wrong?

Regards,
Anup
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 42908
    
  69
Both digests work fine for me with both JDK 1.4.2_09 and JDK 1.5.0_06 on OS X. Which JDK versions are you using?
 
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